Engino Stem Buildings & Bridges Construction Toy will discover all types of forces applied in buildings and Bridges and how they are designed to provide massive weight support. They can build 9 working models such as house, a pyramid, various types of bridges and more. Easy to follow instructions + includes 10 pages of theory and facts with explanations of the different scientific principles accompanied by fun experiments to test newly acquired knowledge. A 3 page quiz section is also included. For ages 9+. Interactive 3D app lets children build in virtual reality.